21357253

Appears in sequences

• a(n) is the smallest k such that prime(k+i) (mod 6) takes successively the values 5, 5, ... for i = 0, 1, ..., n-1.at n=16A247967
• a(n) is the smallest k such that prime(k+i) (mod 6) takes successively the values 5, 5, ... for i = 0, 1, ..., n-1.at n=17A247967
• Index of the first prime which starts a run of n consecutive primes all congruent to each other mod 3 (or mod 6).at n=17A276414
• a(n) is the least k such that the residues mod 3 of the primes prime(k), prime(k+1), ... comprise a string of n 2's followed by 1.at n=17A391796